Inductive reactor



Patented Mar. v(5, 19258. i

- UNITED-"STATES J-'AMES MCIN'IO'SH, NORRISTOWN, PENNSYLVANIA, ASSIGNOR T0 DIAMOND STATE FIBRE COMPANY, OF BRIDGEPOBT, PENNSYLVANIA, A CORPORATION OF DELA- WARE.

INDUCTIVE REACTOR. i

This invention relates to tuning devices or inductive reactors such as used in radio apparatus, and the principal object of the invention is to provide a novel device of this 6 character havmg by reason of its inherent y illustrated a ltuning device made in accordance with my invention:

Fi re 1 shows a coil of wire encased in a solid cast or molded body, the material of which entirely surrounds each of the sep.

arate coils of wire, and noty only completely -covers and protects them, but retains them in their proper relative positions;

'Fi 2 shows a coil of wire embedded in a solid body of hollow cylindrical form;

Fig. 3 is a longitudinal section illustrating the coils shown in Figs. land 2 arranged with the former coil partially 1nserted within the latter, and

Fig. 4 is a longitudinal section illustrating an inductive reactor comprising` a primary and secondary coil, the former within the latter, both embedded in a hollow cylindrical body. j Y

In practicing my invention, I prefer to "employ glasses the embedding or body material. Thus, as in Fig. 1, I may embed a wire coil 1 of suitable dimensions and with a desired number of convolution's within a solid cylinder, 2, of glass, the coil being preformed and ca'st in the glass cylinder.

As therein illustrated, the opposite ends, or

'terminals of the coils, 3 and 4 project through the ends of the cylinder 2 to progg vide for connecting the coil in an electric circuit.

As an alternative form of this device and one which may be used in conjunction'with In the attached drawings, in which I have4 coils made as illustrated in Fig. 1 to form inductive reactors of a type hereinafter set forth, I may, as illustrated in Fi 2, embed a coil 5 in a hollow cylinder 6 0% glass, the ends, or terminals of the coil, 7 and 8 projecting from the ends of the cylinder 6 as clearly illustrated.

The coils shown in Figs. 1 and 2 may be employed in conjunction with each other to form an inductive reactor consisting of an inner or primary coil and an outer secondary coil. Thus the cylinder 2 illustrated in Fig. 1 may be of such size as to lit neatly within the hollow cylinder or tubular body 6, and

Lder 9, as illustrated in Fig. 4. In thisinstance, the cylinder 9, preferably of glass, is

l shown hollow, but it may be made solid if desired. The device comprises an inner coil 10 and outer coil 11, the terminals 1,2 and 13 of the coil 10 extending through opposite ends of the cylinder on a side diametrically opposite lthe terminals 14 and 15 of the coilvll.

In making a device of this character, exceptionally desirable results may be obtained with the use of glass, andglass, therefore, is preferred as the embedding or bodyforming material. I do not, however, wish to limit my invention to glass alone, and other electrical insulating materials capable of being cast or molded aroundthe preformed coil and hardened may be successfullyl used without departing from the invention. Such materials for example as rubber or rubber composition, shellac, and natural or synthetic resins or waxes may be used. Bakelite or similar phenolic condensation product is particularly well adapted for formation of these devices.

While the present description is confined to tuning devices involving coils, it is obvious that the invention in its broader prin- `when arranged as illustrated in Fig. 3, a Y

g .morose i ciples may extend to other devices such for second form and having its extremities pro- I0 example as `coiudensers jectng therefrom.

l claim: 2. An inductive reactor comprising at l. An inductive reactor comprising e holleast two coils of Wire arran ed one Within low cylindrical form of glass, a coil of wire the other and `each embedde in a suitably embedded in said form with its ends proshaped form of glass, the ends of each of 15 jecting therefrom, a second form of glass the coils projecting and exposed. adapted to fit Within the mst-mentioned "form, and a coil of Wire embedded iu seid JAMES MCllNTOSl-l. 

